Examples of org.eclipse.jface.text.ITextViewerExtension

org.eclipse.jface.text.ITextViewerExtension
Extension interface for {@link org.eclipse.jface.text.ITextViewer}.
This extension interface replaces the event consumer mechanism ( {@link org.eclipse.jface.text.ITextViewer#setEventConsumer(IEventConsumer)}) with a set of methods that allow to manage a sequence of {@link org.eclipse.swt.custom.VerifyKeyListener}objects. It also adds
- access to the control of this viewer
- marked region support as in emacs
- control of the viewer's redraw behavior by introducing setRedraw(boolean)
- access to the viewer's rewrite target.
A rewrite target ( {@link org.eclipse.jface.text.IRewriteTarget}) represents an facade offering the necessary methods to manipulate a document that is the input document of a text viewer. @since 2.0

    }
  }


  private void beginCompoundChange() {
    if (!fHasOpenCompoundChange) {
      ITextViewerExtension extension= (ITextViewerExtension) fCurrentTarget.getViewer();
      IRewriteTarget target= extension.getRewriteTarget();
      target.beginCompoundChange();
      fHasOpenCompoundChange= true;
    }
  }

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    try {


      IDocument document= fContentAssistSubjectControlAdapter.getDocument();


      if (fViewer instanceof ITextViewerExtension) {
        ITextViewerExtension extension= (ITextViewerExtension) fViewer;
        target= extension.getRewriteTarget();
      }


      if (target != null)
        target.beginCompoundChange();

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      return;
    }


    fRelayoutRequired= false;
    if (fCachedTextViewer instanceof ITextViewerExtension) {
      ITextViewerExtension extension= (ITextViewerExtension) fCachedTextViewer;
      Control control= extension.getControl();
      if (control instanceof Composite && !control.isDisposed()) {
        Composite composite= (Composite) control;
        composite.layout(true);
      }
    }

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  private void layoutTextViewer() {


    Control parent= fTextViewer.getTextWidget();


    if (fTextViewer instanceof ITextViewerExtension) {
      ITextViewerExtension extension= (ITextViewerExtension) fTextViewer;
      parent= extension.getControl();
    }


    if (parent instanceof Composite && !parent.isDisposed())
      ((Composite) parent).layout(true);
  }

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   */
  public boolean prependVerifyKeyListener(VerifyKeyListener verifyKeyListener) {
    if (fContentAssistSubjectControl != null) {
      return fContentAssistSubjectControl.prependVerifyKeyListener(verifyKeyListener);
    } else if (fViewer instanceof ITextViewerExtension) {
      ITextViewerExtension e= (ITextViewerExtension) fViewer;
      e.prependVerifyKeyListener(verifyKeyListener);
      return true;
    } else {


      StyledText textWidget= fViewer.getTextWidget();
      if (Helper.okToUse(textWidget)) {

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   */
  public boolean appendVerifyKeyListener(VerifyKeyListener verifyKeyListener) {
    if (fContentAssistSubjectControl != null)
      return fContentAssistSubjectControl.appendVerifyKeyListener(verifyKeyListener);
    else if (fViewer instanceof ITextViewerExtension) {
      ITextViewerExtension extension= (ITextViewerExtension)fViewer;
      extension.appendVerifyKeyListener(verifyKeyListener);
      return true;
    } else {
      StyledText textWidget= fViewer.getTextWidget();
      if (Helper.okToUse(textWidget)) {
        textWidget.addVerifyKeyListener(verifyKeyListener);

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   */
  public void removeVerifyKeyListener(VerifyKeyListener verifyKeyListener) {
    if (fContentAssistSubjectControl != null) {
      fContentAssistSubjectControl.removeVerifyKeyListener(verifyKeyListener);
    } else if (fViewer instanceof ITextViewerExtension) {
      ITextViewerExtension extension= (ITextViewerExtension) fViewer;
      extension.removeVerifyKeyListener(verifyKeyListener);
    } else {
      StyledText textWidget= fViewer.getTextWidget();
      if (Helper.okToUse(textWidget))
        textWidget.removeVerifyKeyListener(verifyKeyListener);
    }

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    try {


      IDocument document= fViewer.getDocument();


      if (fViewer instanceof ITextViewerExtension) {
        ITextViewerExtension extension= (ITextViewerExtension) fViewer;
        target= extension.getRewriteTarget();
      }


      if (target != null)
        target.beginCompoundChange();

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    if (start) {


      if (fViewer != null && fAutoAssistListener == null) {
        fAutoAssistListener= new AutoAssistListener();
        if (fViewer instanceof ITextViewerExtension) {
          ITextViewerExtension extension= (ITextViewerExtension) fViewer;
          extension.appendVerifyKeyListener(fAutoAssistListener);
        } else {
          StyledText textWidget= fViewer.getTextWidget();
          if (Helper2.okToUse(textWidget))
            textWidget.addVerifyKeyListener(fAutoAssistListener);
        }
      }


    } else if (fAutoAssistListener != null) {


      if (fViewer instanceof ITextViewerExtension) {
        ITextViewerExtension extension= (ITextViewerExtension) fViewer;
        extension.removeVerifyKeyListener(fAutoAssistListener);
      } else {
        StyledText textWidget= fViewer.getTextWidget();
        if (Helper2.okToUse(textWidget))
          textWidget.removeVerifyKeyListener(fAutoAssistListener);
      }

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    if (!fKeyListenerHooked) {
      StyledText text= fViewer.getTextWidget();
      if (Helper2.okToUse(text)) {


        if (fViewer instanceof ITextViewerExtension) {
          ITextViewerExtension e= (ITextViewerExtension) fViewer;
          e.prependVerifyKeyListener(fInternalListener);
        } else {
          text.addVerifyKeyListener(fInternalListener);
        }


        fKeyListenerHooked= true;

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